Continued decline of total ozone over Halley, Antarctica, since 1985

Article Abstract:

Total spring time (October to January) ozone measurements at Halley, Antarctica (75 degrees, 31 inches south; 26 degrees, 40 inches west) shows that the ozone hole has continued to deepen since 1985. The October mean and minimum total ozone have continuously decreased. Significant increases in ultraviolet-B radiation are expected at the surface over Antarctica as the ozone loss extends into January and February. Temperature readings appear to match the ozone cycle with colder temperatures between October and January. Adherence to the Copenhagen Amendment should resolve the problem by mid-2000.

Measurement, Environmental aspects, Antarctic regions, Ozone layer depletion

---

Identification of two sources of carbon monoxide in comet Hale-Bopp

Article Abstract:

Observations of comet Hale-Bopp using the cryogenic echelle grating spectrometer on the NASA IRTF 3-m telescope at Mauna Kea Observatory, Hawaii, indicate that around half of the carbon monoxide (CO) in the comet comes directly from ice stored in the nucleus. It has been established that the onset of distributed CO emission cannot be attributed to increased dust production alone. It is likely that a threshold, probably thermal, is reached for release of additional CO in the coma.

Carbon monoxide, Hale-Bopp (Comet), Hale-Bopp comet

---

CHON as a component of dust from comet Halley

Article Abstract:

Comet Halley's carbon, hydrogen, oxygen and nitrogen (CHON) particles exist in combination with silicates at the submicrometer level rather than in isolation as previous studies had indicated. Particle mass spectrometers aboard the Vega-1 and Giotto space vehicles found no evidence of pure CHON particles at the nanometer level.

Composition, Astronomical spectroscopy, Halley's comet

Similar abstracts:

• Abstracts: Changes in oceanic and terrestrial carbon uptake since 1982. The age of river carbon
• Abstracts: Infuence of subglacial geology on the onset of a West Antarctic ice stream from aerogeophysical observations. Aerogeophysical measurements of collapse-prone hydrothermally altered zones at Mount Rainier volcano
• Abstracts: Acoustic alarms reduce porpoise mortality. Genome diversity alarms. Trade and environment: alarms about the risk of food contaminants may become a powerful non-tariff restraint on trade
• Abstracts: Satellite maps ozone destroyer. Surface ozone depletion in Arctic spring sustained by bromine reactions on aerosols
• Abstracts: Fossils of large terrestrial arthropods from the Lower Devonian of Canada. End of the 'Uniramia' taxon

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.